Well but the work in the dust dances, usually of the moisture in the breath is less likely to be painful, such as breath it's mask, the would inhale the dust in order to speak while floating the mask by hand when you talk but, when you use a dust mask that with this filter, to not suffocation we hear normally even talking while wearing a mask. And, I think good to very body because in the mouth and nose little dirty. I do not love it in the future!